notes on new power mac (was Re: clusters v SMP)
hahn at physics.mcmaster.ca
Mon Jan 28 18:38:03 EST 2002
> The 4GB memory restriction of an Intel node would be too
> restrictive for some of our users. The majority I suspect are
reading this triggered me to look at the specs of the new Mac.
after all, the PPC is a reasonably nice architecture, and afaik
isn't maimed by 32b-isms.
anyway, ignoring Apple's inane marketing-twit-speak, the specs are:
dual PPC G4/1000
256K onchip L2
2M per-CPU DDR sdram L3 cache
133 MHz FSB,
3 slots of PC133 (non-ddr) sdram
4 64x33 PCI slots,
360W max power.
personally, 2M seems strangely small for DDR, since it's not
either fast or wide. probably a single chip. they'd obviously
be much better off (at least from a beowulf perspective) by
biting the bullet and finally engineering a decent dram bus.
3 dimms also means it has no ram-size advantage over commodity
(ia32) parts. builting gigE is interesting.
in short, a nice workstation, but not well-suited to cluster nodes.
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